Plumbing Bids & Bid Invitations for Subcontractors
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Plumbing bid opportunities are not limited to one phrase. Public owners and general contractors describe the same work as plumbing, fixtures, domestic water, sanitary waste and vent, backflow prevention, water heater replacement, repipe, restroom renovation, rough-in, or Division 22 work. A useful plumbing bid page has to watch those terms together, not as separate searches.
ConstructionBids.ai monitors 12,500+ public bid portals and helps subcontractors turn that spread of source language into a workable daily search. Sub-Hub Free lets plumbing firms start without a credit card. Sub-Hub Pro adds the full match-score breakdown, AI scope analysis, alerts, saved bids, and document access for $39/mo after a 7-day free trial.
Use this page as a reference for where plumbing bids appear, how GC bid invitations usually reach plumbing subs, and what to prepare before asking to be added to a GC bid list.
Trade reference
| NAICS | 238220 Plumbing, Heating, and Air-Conditioning Contractors (shared with HVAC) |
|---|---|
| CSI | Div 22 Plumbing |
Open Plumbing Bids Right Now
24 open plumbing bids across 5 states on public portals. Updated Jul 10, 2026.
| Project | Agency | Location | Bid due |
|---|---|---|---|
| Commercial Plumbing Supplies & Fixtures | West Virginia Purchasing Group | WV | Jul 10, 2026 |
| Plumbing/Mechanical Inspector | Rhode Island Purchasing Group | RI | Jul 16, 2026 |
| MAPS 4 MULTIPURPOSE STADIUM Bid Package 3.10 Plumbing | Oklahoma Purchasing Group | OK | Jul 17, 2026 |
| SMPD_MATERIALS_ Various Plumbing Items such as nipples, stem trap, gasket, fl... | Housing Authority | NY | Jul 20, 2026 |
| Churchville Shop Plumbing Services in Harford County | Maryland Purchasing Group | MD | Jul 21, 2026 |
| INSTALL NEW INSULATION AROUND ALL PLUMBING | West Virginia Purchasing Group | WV | Aug 18, 2026 |
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How GCs invite plumbing subs
GC plumbing invitations usually start from a bidder list built around license fit, fixture and rough-in experience, service geography, bonding capacity, safety record, and whether the package is renovation, new construction, service replacement, or a larger mechanical scope. The invitation can arrive from a plan room, bid management platform, direct estimator email, or a prequalified mechanical and plumbing list.
Plumbing scopes are often split across fixtures, domestic water, sanitary waste and vent, storm piping, gas piping, water heaters, backflow prevention, rough-in, trim-out, testing, and insulation coordination. Division 22 should be separated from Division 23 HVAC and hydronic mechanical work when boilers, pumps, controls, or heating-water piping make the boundary unclear.
The best response confirms license coverage, fixture counts, backflow certification, water heater assumptions, rough-in and trim responsibilities, testing, med-gas exclusions when applicable, and whether boiler-adjacent or hydronic work belongs to plumbing, mechanical, or a specialty contractor.
Win more relevant invitations
- Search beyond plumbing. Include fixture, domestic water, sanitary waste, vent, backflow, water heater, repipe, restroom renovation, rough-in, trim, and Division 22 terms.
- Separate Division 22 from Division 23 when boilers, pumps, hydronic piping, controls, gas piping, or equipment connections make the plumbing and mechanical boundary unclear.
- State med-gas boundaries clearly. Medical gas is a specialty scope and should be included only when the bid documents and your credentials support it.
- Confirm journeyman, master, contractor, local permit, and backflow certification requirements before bidding in a new jurisdiction.
- Use fixture schedules and plumbing drawings together. Fixture counts, rough-in conditions, trim packages, and alternates can change the estimate quickly.
- For renovation and repipe work, identify shutdown windows, temporary service, access limits, existing conditions, patching, and after-hours assumptions before bid day.
How to Bid Plumbing Work on Public Projects
- Step 1
Find plumbing bid sources
Search public owner portals, SAM.gov, school district listings, healthcare and housing authority procurement pages, municipal facility bids, state portals, and plan rooms for plumbing, Division 22, fixtures, domestic water, sanitary waste, vent piping, backflow, water heater, repipe, restroom renovation, and rough-in. Many plumbing scopes appear inside larger building or mechanical packages.
- Step 2
Read Division 22 and the boundary notes
Review Division 22 plumbing specifications, plumbing drawings, fixture schedules, addenda, alternates, and coordination notes. Confirm where Division 22 ends and Division 23 begins, especially for hydronic piping, boilers, pumps, controls, insulation, gas piping, and equipment connections. Name med-gas as excluded unless the documents and your credentials clearly include that specialty scope.
- Step 3
Check license and certification requirements
Before pricing, confirm journeyman, master plumber, contractor registration, local permit, backflow prevention, and inspection requirements for the jurisdiction. Public plumbing work may also require bonding, insurance, prevailing-wage compliance, certified payroll, safety documentation, and owner or GC prequalification before the bid is treated as responsive.
- Step 4
Estimate fixture counts and renovation risk
Build pricing from fixture counts, rough-in quantities, pipe materials, valves, cleanouts, water heaters, backflow devices, insulation, testing, demolition, patching boundaries, access limits, and phasing. Renovation and repipe work need extra attention to shutdown windows, existing conditions, tie-ins, temporary service, concealed piping, and after-hours work.
- Step 5
Submit a compliant plumbing bid
For owner bids, follow bid forms, addenda acknowledgments, alternates, bonds, license forms, and upload instructions exactly. For GC invitations, send a scope letter that separates fixtures, rough-in, trim, domestic water, waste and vent, gas, water heaters, backflow, testing, exclusions, med-gas boundaries, and Division 23 interfaces.
- Step 6
Track bid tabs and leveling questions
After bid day, review tabulations, award notices, and GC leveling emails. Plumbing quotes are often compared around fixture counts, water heater scope, backflow testing, med-gas exclusions, demolition, patching, hydronic boundaries, and shutdown assumptions. Record those lessons so future Division 22 bids carry cleaner scope language.
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Sample plumbing bid
Plumbing bid questions
Where can plumbing subcontractors find public bids?
Plumbing subcontractors can find public bids on city, county, state, school district, housing authority, healthcare, facility, and federal procurement portals. Search NAICS 238220 with terms such as plumbing, Division 22, fixtures, domestic water, sanitary waste, vent, backflow, water heater, repipe, and restroom renovation.
How do plumbing subcontractors get on GC bid invitation lists?
Start with a concise capability profile, license numbers, backflow certifications if applicable, insurance certificates, bonding capacity, service area, safety contact, project-size range, and public-project references. Tell estimators whether you pursue new construction, renovation, repipe, restroom, service replacement, or full Division 22 packages.
Do plumbing subcontractors need bonding for public work?
Bonding depends on project size, owner rules, and the GC's subcontract requirements. Plumbing subs may be asked for bonding capacity, a consent of surety, or proof that they can support fixture, piping, water heater, and renovation scopes on public projects.
What prequalification documents do GCs usually ask plumbing subs for?
Common prequalification items include plumbing license numbers, insurance certificates, safety history, EMR or OSHA information, bonding capacity, references, project-size range, backflow certifications, similar public-project experience, and a clear list of Division 22 scopes the firm self-performs.
What project scopes are typical plumbing bid opportunities?
Typical scopes include fixtures, domestic water, sanitary waste and vent, storm piping, gas piping, water heaters, backflow prevention, restrooms, repipes, rough-in, trim-out, testing, renovation tie-ins, and plumbing work tied to schools, civic facilities, healthcare, housing, utilities, and public buildings.
What NAICS code should plumbing contractors use for bid searches?
The core NAICS code is 238220, Plumbing, Heating, and Air-Conditioning Contractors. It is shared with HVAC and mechanical work, so plumbing contractors should pair the code with Division 22 and plumbing-specific terms instead of relying on NAICS alone.
Is water heater or boiler work always plumbing scope?
Not always. Water heaters often sit in Division 22, while boilers, hydronic piping, pumps, controls, and heating-water systems may fall under Division 23 mechanical. Read the specifications, drawings, schedules, and addenda before assuming where the plumbing scope ends.
Can Sub-Hub help plumbing subs without a credit card?
Yes. Sub-Hub Free has no credit card requirement. Plumbing subcontractors can start with bid discovery and upgrade to Sub-Hub Pro when they need full score breakdowns, alerts, saved bids, document access, and AI scope analysis.
How do I bid plumbing jobs with no GC relationships?
Use public portals, SAM.gov, school district postings, housing authority bids, healthcare procurement pages, municipal facility listings, and plan rooms to find owner-posted plumbing work. Then contact bidding GCs with licenses, backflow credentials, bonding capacity, service area, and recent Division 22 references.
What plumbing bid exclusions should I list?
Common exclusions include med-gas, patching by others, cutting beyond shown scope, hydronic or boiler work by mechanical, controls wiring, firestopping by others, after-hours shutdowns, concealed conditions, temporary service, and permits not assigned to the plumbing contractor. Match exclusions to the bid documents.
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